Pump dispenser for delivering a predetermined dosage regardless

Details Pump dispenser for delivering a predetermined dosage regardless Pump dispenser for delivering a predetermined dosage regardless

1990-04-06

1991-08-13

Huppert, Michael S.

Dispensing

With discharge assistant

Plural

222321, 222378, 222383, 222385, B67D 552, B67D 540

Patent

active

050389653

ABSTRACT:
A finger operated pump dispenser employing interconnected upper and lower cylinders, first and second pistons disposed in the upper and lower cylinders, a hollow sleeve, and a stem which extends upwardly through the first piston into the sleeve. The first cylinder, the stem and the two pistons define a pump chamber which is filled with fluid. When the dispenser is actuated, fluid is displaced from the chamber into the second cylinder and a port is opened. The port can be made to open at the moment that all of the fluid is displaced into the second cylinder. Once the port is opened, the fluid is discharged and further piston movement enables fluid to be pulled upward out of the container secured to the dispenser via an opening formed between the second piston, stem and inner wall of the second cylinder refilling the chamber. The motions of pistons, stem and sleeve are so controlled that accurate dosage is produced independently of the method of actuation.

REFERENCES:
patent: 4089442 (1978-05-01), Hafele et al.
patent: 4245967 (1981-01-01), Busselet
patent: 4693675 (1987-09-01), Venus
patent: 4726747 (1988-02-01), Skorka
patent: 4735347 (1988-04-01), Schultz et al.
patent: 4823991 (1989-04-01), Skorka
patent: 4941595 (1990-07-01), Montaner et al.

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